Final answer:
The baby's genotype can be AO or AB, resulting in blood types A or AB respectively. A Punnett square can be used to illustrate the possible genotypes.
Step-by-step explanation:
The genotype of the baby can be determined by combining the maternal and paternal alleles. In this case, the mother has blood type A (genotype AO) and the father has blood type AB (genotype AB). The possible genotypes for the baby are AO and AB, resulting in blood types A or AB respectively.
A Punnett square can be used to illustrate the different possible genotypes. The square would have two columns and two rows, representing the possible alleles from the mother and the father. The top row would contain AO and AB, and the left column would contain AO and AB as well. The four possible combinations in the square would be AO, AO, AB, and AB.